Question 1

Which property of water is primarily responsible for the upward movement of water in plants through xylem vessels?

Accepted Answer

Capillary action

Question 2

A scientist is studying a molecule that contains carbon, hydrogen, and oxygen in a 1:2:1 ratio. Which class of organic molecules does this molecule most likely belong to?

Accepted Answer

Carbohydrate

Question 3

Which of the following best explains why water is considered a polar molecule?

Accepted Answer

The oxygen atom is slightly negative and the hydrogen atoms are slightly positive.

Question 4

Which of the following best describes a hydrogen bond?

Accepted Answer

A weak attraction between a hydrogen atom in one molecule and an electronegative atom in another molecule.

Question 5

Which of the following reactions represents the formation of a disaccharide from two monosaccharides?

Accepted Answer

$C_6H_{12}O_6 + C_6H_{12}O_6 \rightarrow C_{12}H_{22}O_{11} + H_2O$

Question 6

Which of the following statements about phospholipids is correct?

Accepted Answer

They have a hydrophilic head and two hydrophobic tails.

Question 7

A solution has a pH of 3. Which of the following best describes this solution?

Accepted Answer

It is acidic and has a high concentration of $H^+$ ions.

Question 8

Which of the following best explains why carbon is so important for life?

Accepted Answer

It can form up to four covalent bonds, allowing for a diversity of stable organic molecules.

Question 9

Which of the following is a correct example of hydrolysis?

Accepted Answer

$C_{12}H_{22}O_{11} + H_2O \rightarrow 2C_6H_{12}O_6$

Question 10

Which of the following best describes the role of proteins in the cell membrane?

Accepted Answer

They act as enzymes, receptors, and channels to facilitate selective permeability.

Question 11

Which of the following is a property of water that allows insects to walk on its surface?

Accepted Answer

Cohesion

Question 12

Which of the following best describes the structure of a nucleotide found in DNA?

Accepted Answer

A phosphate group, a deoxyribose sugar, and a nitrogenous base

Question 13

Which of the following best explains why unsaturated fatty acids are typically liquid at room temperature?

Accepted Answer

They contain double bonds that create kinks, preventing tight packing.

Question 14

Which of the following is a function of cellulose in plants?

Accepted Answer

Structural support in cell walls

Question 15

A patient is diagnosed with a genetic disorder that affects the structure of their phospholipids. Which cellular function is most likely to be directly impaired?

Accepted Answer

Selective permeability of the cell membrane

Question 16

Which of the following best describes the process of dehydration synthesis?

Accepted Answer

Joining two monomers by removing a molecule of water

Question 17

Which of the following is a correct statement about the permeability of the lipid bilayer?

Accepted Answer

It is selectively permeable, allowing some substances to cross more easily than others.

Question 18

Which of the following best explains why water has a high heat capacity?

Accepted Answer

Hydrogen bonds between water molecules absorb heat when they break and release heat when they form.

Question 19

When you hard-boil an egg, the clear liquid part becomes white and solid. What is the best explanation for this change?

Accepted Answer

The proteins denature and form new bonds, changing their structure.

Question 20

Which of the following is a correct pairing of a macromolecule and its monomer?

Accepted Answer

Nucleic acid – Nucleotide

General Biology Study Notes: Water and Organic Molecules in Organisms

Study Guide - Practice Questions

Study Guide - Flashcards